Dowel pin and cup for mounting patterns



4 1,471,978 s. B. PHELPS I DOWEL PIN AND CUP FOR MOUNTING PATTERNS Filed May 4, 1922 1 WITNESSES (gag g' INVENTOR r, v 30 w 564% %?/M\ 2/ fffg yvelzlzea W I v ATTORNEYS Patented Get. 23, 1223.

enters STEPHEN B. PHELPS, .OF PIT'ISBURGE, PENNSYLVANIA.

nownr. rm earn our FOR Mounrme rnr'rnnns.

7 Application filed May 4,

To all whom it may concern Be it known that I, STEPHEN B. PHELrs, a citizen of the United States, and a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented a new and Improved Dowel Pin andCup for Mounting Patterns, of which the following is a description. V

My invention relates to a dowel pin and cup adapted to be secured respectively to a half pattern and to a pattern board, and arranged for centering the pattern on the board.

The general object of the invention is to provide an improved means-for the indicated purpose promoting facility and'saving time in the placing and accurate centering'of the half pattern.

The natureof the invention and its distinguishing features and advantages will clearly appear as the description proceeds.

Reference is to be had to the accompanying drawingsforming a part ofthis specification, it being understood that the drawings are merely illustrative of practical examples of the invention.

Figure 1 is a plan view of a pattern board equipped with my improved sockets;

Figure 2 is an under side view of a half pattern provided with dowel pins to engage the sockets in the pattern board;

Figure 3 is a cross section of the half-pattern in position on the pattern board, the view indicating in dotted lines the molding flask;

Figure 4: is an elevation of a dowel pin in slightly modified form, a fragment of the pattern being in section;

Figure 5 is a vertical section of the pattern board and my improved pin socket;

Figure 6 is a vertical section showing a fragment of the pattern and a further modification of the pin;

Figure 7 is a vertical section through a portion of the pattern board and a modification of my improved cups;

Figure 8 is a plan view of the cup shown in Figure 7.

It will be understood that my improved dowel pins and cups are adapted for use in centering patterns of various kinds. I have shown in Figure 1 an ordinary pattern board A. having my improved cup 10 secured by pins 11, the number and arrangement of the cups being adapted for the dowels on a half pattern B for molding a pipe section, said 1922. Serial N0. 558,386.

pattern B having dowel pins comprising shanks 12 and blocks 13. In Figure 3 the shank 12 is shown in the form of a screw. In Figure 1 the shank, (15) securing the block 16 to the half pattern B is shown as a nail passing through the bore of the block the same asthe screw 12. The block 16 has the edge rounded as at 18, Figure 4:.

Cups 10 are'secured by a nail 11, or screw, or the like passing through .the bottom of the cup centrally thereof and into the material of the pattern board A. The edge 17 of the cup is bevelled to facilitate the entrance of the pin block 16.

In Figure 6 the pinis in the form of a cup-like shell 19 driven with its open end into the material of the half pattern here indicated by the letter C. The said shell and thecup hereinafter referred to' are formed with crimps 20.

In Figure 7 is shown a cup 21 to receive the pin 16,- said cup-fitting in a corresponding recess in the-pattern board D. The crimps20 are produced in a manner that the pins 19 and cups 21 present eXteriorly angular parallel ribs so thatthe pins and cups may be driven into the pattern and pattern board respectively for solidly holding the pins and cups in place to prevent turning.

The device takes the place of wooden and other dowels now in use and has an advantage that it retains its form and size permanently so that the pattern is prevented from shifting by looseness between the dowel and cup. A great advantage of the device also is that it can be used to mount patterns on boards to permit orders for only one casting, thereby saving cost owing to the slight expense of screwing two or three dowels to the half pattern or patterns, in accordance with my invention, whereas with the common method of mounting patterns the cost is too great to leave a saving even though several castings are to be made on the one order. A. further great value of the described device is that it saves expense of making complete patterns when they are symmetrical, as only half a pattern is used by casting with patterns secured by the cups and pins described.

Even in instances where the pattern is not of even single patterns.

and cores permits numerous irregular patterns to be made with only half apattern and eifect a saving'in some instances of' large amounts o'fmoney in the construction The method of casting; with my improved dowel pins and cups also saves the cost ofinakinga pattern 1 board for those patterns on which orders are large enough that would even warrant expensive patterns, for r with the I foundry equipped' w'ith pattern boards the half pattern only'needsj to be made and the dowels screwed or otherwise fastened into, place thereon. [One pattern board can be used "for several sizes of flasks by inserting more or'less wear plates infthe board toc'orre'spond with the pinholes .in the flask. An important advantage al'so'is that the improvement permits unskilled labor at low'wage cost to make the 'm'oldsjo'f molding machinesj'and' with a greatfsavingy in time over the hand methodsandwhere skilled molders are neces sary for fioormolding. The invention permits also the mounting of'patterns on boards of very large patterns which areabove the capacity of the usual machines or available in mostshops. A saving is also effected over I the bedding'in? methods of molding as well and thus two castings can be'made praeti- V t It will be under-'- cally'in theusual time it for making one onoa machine, the dowels in this case being screwed into each pattern to match the suitably located 'dowel'cups set in the board's.

illustrated examplesconstitute practical embodiments of my invention; I do not limit myself strictly to the exact details herein illustrated, since, manifestly, the'same can be considerably varied without departure from the spiritzof the invention as definedinthe I V appended claims. r

JHaVingJthus. described m invention, I

1;.:patt ernlholder foru'se in foundries 401 I would staterinrcionclusion that while the cornprising a cup-shaped'bodyjadapted:for' V the reception of a-dowel' pin andhaving a bottom, wall provided with a centrally ar-' rangedopening; and,"- a fastening member adapted to extend throughsaid opening for securing the cup-shaped body in position.

a QnInja-pattern holder foruse'in foundries,

the combinationf'with a pin of cylindrical formation having a longitudinalopening ext'ending entirely 'therethrough, of a cup to receive said pin and having; abottomfwall provided with alongitudinal opening, and

separate fastening membe s extending s;

through said: openings for securing the pin and theeup .in positionl' V V 3, The construetionrset said cup being exteriorlysmooth. V

sail in claim 2, 7'

sTEPnEu PHELPS. V 

